All Festool vacuums come with HEPA filters and one fitted filter bag (The Mini comes with a spare bag). HEPA (High Efficiency Particulate Air) filtration was originally developed by the Atomic Energy Commission to remove radioactive dust from the air, so you know it’s the gold standard for filtration. Festool’s filtration frees the air of over 99% of air particulate, down to .3 microns in size. The Festool flat filter has a surface four times greater than regular corrugated filters and the vacuum’s design allows full use of the filter bag.Festool vacuum bags are meant to be replaced after they fill to ensure the maximum dust collection. We also stock reuseable "long life" bags, although most people do prefer the replaceable bags. Periodically you should check and replace your HEPA filters.